End of the day communism regime just change how country do things, not why things are done. National character stay the same. Russia is still Russia, still warrior race that likes to fight with religious like conviction. Still likes to spread their own 'religion'. Still likes new types of imperialism. China is still China.Spreading communism throughout the world won't stop genocides like the one that is happening in Palestine. As much as people hate to admit, there were genocides and ethnic cleansing in communist countries, just take a look at South East Asia. A better way to stop genocides is to strive for the great unity, a concept in Confucianism.
China keeps talking about building a community with a shared future for mankind, this concept doesn't sound very communist, but rather Confucian.